Gravity-level.



H. J. GARRIGAN.

GRAVITY LEVEL. APPLICATION FILED MAY 8; 1908.

, Patented Jan.5,1909

a citizemof the UnitedfStates, residing at Buffalo, in the county ofErie. and State of- 317M153 PA OFFICE- HENRY G IGWJ F F LQQ NEWYGRKJSSIGNOR To. WILLIAM nfnouu'r, or BUFFALO,N.EW YonK.

To ,allwhora, it star concern:

Be it .known that .I', HENRY J. CARRIGAN},

New York,3have-invented a certain new and usefullmpro'vement inGravity-Levels, of

- which the iollowin-g-is a specification.

This invention relates 50 animproved gravity=level andsthe obj ec't' ofthe invention ist-o' provide-a universal movement for theindicating-hand. l I

'i he invention" also relates-1 to a certain details of construction ofthe levelwhich will he hereinafter described and claimed referprovedgravity level on line b b, Fig. 3 the once bein had tothe accompanyingdraw lndicating needle being shown in elevation.

Fig. 3 is a top plan view of the improved gravity level. Fig. 4 is ahorizontal section through the improved gravity level on line 0 c,Fig. 1. Fi 5 is an enlarged frag- Fig. 6 is an enlarged fragmentarysection'through the mounting of the concavo-convex glass of r theindicator. Fig. 7 is an enlarged fragmentary section through theoscillating mechanism showing one of the cone bearings. Fig. 8 is a,view of another form of the oscillating mechanism artially in section.

In referring to the rawings in detail like numerals designate likeparts.

In the accom anying drawings a fragment 1, of a suitable ar or the likeis shown in an opening 2 of which the improved gravity level is mounted.The opening 2 is circular in form and extends vertically thro ugh fromthe top to the bottom of the bar which is preferably rectangular in formand of wood.

The bevel frame consists of -an annular lower ring 3, an upper ring 4 ofslightly smaller circumference than the lower ring and located in aplane above the lower ring,

. opposed angular frame bars 5 which are fastened rigidly to oppositesides of the rings 3 and 4 and have outwardly extending horizontalportionsfi in which the lower ends of bolts Z screen The. Wond at thelower part S11 )eci ncati on otIlett exi Ietent. Applicationflladlay8,196. Serial 1104313543."

-' a at opening a at away on or. are an;

as shown at 8 m Fig. 1 to prom e openings to receive the horizontalportions,- v y The. osci} ting mechanism comprises ring 9 which 1sarranged concentrically within the/upper ring t and. has two o positelye1".- tendmg cone points 10 which t in, conic Patented rm. p, 1960.;

recesses in the inner ends of supporting'ji ring 4, an indicating needle12 havinglh.

weight 13 at its lower end and an interme dlate horizontal cross beam 14provided? screws 11 located on oppositesides of tliqigf with conicalends which fit in the conical t a I cesses in the inner ends of screws15 mounted in the rm 9. The screws 15 are located at right" ang es tothe screws 11 sothat the W:

needle 12 can swing universally in'any diree tron oneith'er the axis ofits cross beam; or

the axis of the ring 9 as the her 1 is turned to indicate the degree ofinclination. The screws 11 and 15 are preferably of similar. diameterthroughout their length with screw threads out uniformly from endto'end'as shown in Figs. 1, 2, 4 and 7, and have a slot for the reception of ascrew driver at one, end and a conical recess at the opposite end. Thescrews ll and 15 are ad'ustable to take up wear or lost motion and alsoto enable the indicating needle 12, to be centered accurately. Theweight 13 is preferably bell shaped as shown in Figs. 1 and 2.

per ends of the frame bars 5 and forms a sup port for the top cover ofthe level. The top cover 17 of the level is of glass or othertransparent material and is of concavo-convex A ring 16 of light thinmetal and of angular 8\ form in cross section is mounted upon theupmetal rim 19 is fitted on the edge of the cover and held in place by aspring ring 20. The

rim 19 has a depending flange 21 which seats within the upper ortion ofthe ring 16 asi shown in Fig. 6 and an outer metal protector 22 ofannular form is fitted upon the flattened edge of the glass cover. [Theprotector 22! has a top horizontal flan e 23 which is set, flush in thetop'surface o the bar 1 around the opening 2 and fastened in place byscrews U I g 24. The heads of the bolts 7 are sunk in recesses 25 in theflange 23, see Fig. .5 and the lower surfaces of the heads are roundedas shown at 26, in Fig. 5 so that the bolts may turn slightly. The.openings 27 through which the bolts 7 ass are made slightly larger thanthe shan rs of the bolts to ermit a slight lateral movement to the boltsor the purposes of adjustment. The level is adusted so as to beperfectly true in its position in the bar 1, by the bolts 7 andtransverse adjusting screws 28 which through the sides of the bar andengage against opposite sides of the ring 3, as shown in Fig. 2. Thescrews 28 are located between and at right angles to the bolts 7 toprovide for adjustment in any direction and thus al low the instrumentto be brought to absolute trueness.

A scale for indicatingthe degree of inclination is cut tr otherwiseformed in the cover nd consists of a series of concentric circular rings29 and a series of figures 30 indicating the degree of each ring asshown in Fig. '3.

The advantages of this improved level reside in its accuracy anddelicacy of oscillation, its unusual manner of indicating, the manner inwhich it can be trued and the way pass horizontally 'ends of the crossbar of in which it can be assembled or dismounted or ad usted.

I claim as my invention In a gravity level, a frame including astationary outer ring, a smaller inner ring located concentricallywithin the outer ring and having oppositely extending cone proj ections,screws adjustably fitted in opposite sides of the stationary outer ringhaving re cesses in which the cone proections of the inner ring engageto pivotall y support the inner ring in the outer rin a vertical indiecating needle having a weighted lower end and an intermediate cross barhaving opposite con'e ends, screws adjustably fitted in opposite sidesof the inner ring and at substantially right angles to the screws inthe'outer ring and having recesses in which the cone the indicatingneedle enga e to pivotally support the indicating need e in t e-innerring and an indicating scale over the indicatingneedle, substantially asset forth. 5

HENRY. J. CARRIGAN.

Witnesses:

L. M. SANGSTER, GEORGE A. N EUBAUER.

